One of these patterns has formed on a Gulf Coast beach; the other one is on Mars (courtesy of @HiRISE ). http://pic.twitter.com/FH39eLO9Uj
— Zoltán Sylvester (@zzsylvester) September 30, 2017
via Twitter https://twitter.com/zzsylvester
September 30, 2017 at 08:02AM
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